Electrical apparatus



H. BAILEY.

ELECTRICAL APPARATUS.

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Patented Feb. 6, 1923 v U N l T E D S T A T HALSTED BAILEY, OF IITTSFIELZ), MASSACRU I TRZ'L GOMPANY, 1L USER-DEATH.

Appl time filefi Sept-:1

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i 16 in the aounty of Ber usazsh'usetts, have invehtavl useful Improvements in ms, at which the ifeim'vsd.

invention relax-ms ti aswitch. meal a- Which is adapted t5 mums selecmc. A 7.0mm 0r wlndmgs in (issue 2' prmdgiau c mecha'msm 'Whlifh. readiiy manufacand it has for its object 5,. Improved farm of swlteh 'ged, durabie and been 51142 such I as windings mla 'ivns,

tra nsrkcrm'ers and the like M1051: were in be connected in w in wider to yield voltages of simm ties, to provide than vi which bx-P,- fiaps can be sonnec-tsci "1511 the insuiati' 7 Windin 5 his connea flies :mtice of my inventin; 42 use tftfiilinfii s. uncertainties izJ TL have provieu 2L *30 which the m be 1m? orknob to get de 5; '1 v pmvid'ai by my invent-ion is preferabl'v so designed 51m it can msrgjed in the insuiating' z-c-Lmris the windings v desired ralzz" 122i mxwce "z'rit of the l ven siting M6; 5.1%.

rings 26, asshown in Figs. 3, 4: and 5. The contact member 25, to be readily manipulated, is mounted on an offset or eccentric portion of the shaft 27 which is rotatably mounted in the tube or frame and which is preferably coincident with the axis of the tube 15 where the contacts 18 are at equal radial distances from the axis. A knob 28, as shown at the upper end of the tube, is provided so that the shaft may be manually actuated.

The sectionalizing of the contact member 25 is conveniently accomplished as shown in Fig. 6 by supporting individually the annular sections 26 in a flexible manner on the shaft 27. This flexibility is readily effected by resiliently supporting the sections on the offset portion of the shaft 27, where a sleeve able, markings placed on the cap plate 34.-

which is rigidly secured in tube 15. Any suitable indicating device however may be employed.

The ventilation of the tap changing device is accomplished by placing large openings 10 and 41 diametrically opposite each.

other in the side of the tube lfi adjacent the contacts 18 and by providing one or more vertical passages 42 in the bases 16 and 17 respectively; egress for the medium enter- 'ing the passages 42 being provided by openings 43 placed in the side of the tube 15 at a sufficient distance from the top of the tube to be normally below the surface of the cooling and ventilating medium.

In the modified form of the tap changing dcvice shown in Ifig. :fflexibility for the contact member 25 is provided by making it of a helical spiral spring, as shown at36, the ends having a conical form as shown at 37, in order to secure a centering effect, when .mountcd on the offset portion of the shaft 27. In other respects this modified'form of device is shown like that in Figs. 3 and 4:.

In operation, to change the voltage ratio of the transformer shown the knob 28 is turned to move the member 25 from bridging one pair of contacts 18 to any other detions of winding P are in service, or to one of the other three positions where an intermediate number of sections are 1n service.

While I have here shown an embodlment of my invention which isat present the best means known to me for carrying the same into eti'ect, I would have it understood that i this is merely illustrative and that I do not mean to be limited thereby to the precise details here disclosed since obvious alterations thereof will appear to those skilled in this art, nor in the choice of recognized equivalents except as defined in my claims hereunto annexed.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. A tap changing device comprising a supporting frame having insulating bases therein, contact rods rigidly secured at each end in said bases parallel to the axis of said frame, a rotatable shaft mounted centrally of said contact rods, and a sectionalized bridging member resiliently secured on an ollset portion of said shaft and arranged to make linear, engagement with said contact rods.

2. A tap changing device comprisinga tube having insulating bases therein. contact rods rigidly secured at each endin said bases parallel to the axis of said tube, a rotatable shaft mounted centrally of said contact rods, a manipulating knob having an indicating device secured on said shaft externally of said tube, and a sectionalized annular bridging member resiliently mounted on an offset portion of said shaft.

3. A tap changing device comprising a tube having insulating bases therein, contacts mounted in said bases parallel to the axis of said tube, a rotatable shaft mounted centrally of said contacts, and a bridging member resilientl mounted on said shaft, said shaft coinciding with the axis of said tube, said tube and said bases being provided with ventilating passages. I y

In witness whereof. I havehereunto set my hand this 21st dlziy of Se tember, 1918. ALS'I JD BAILEY. 

